我连接ftp提示连接超时，什么原因？？？
我用leapFTP连接，但出现错误，报告如下，希望大家帮我看看怎么回事，同样的东西我在公司可以连上，回家用就有错误！！连接到 edu.51testing.net, 端口 21 (#1)
解析主机为: 61.129.34.21
已连接.正等待响应.
220 Serv-U FTP Server v6.1 for WinSock ready...
USER gongju
331 User name okay, need password.
PASS xxxxxx
230 User logged in, proceed.
SYST
215 UNIX Type: L8
REST 100
350 Restarting at 100. Send STORE or RETRIEVE.
REST 0
350 Restarting at 0. Send STORE or RETRIEVE.
PWD
257 "/" is current directory.
TYPE A
200 Type set to A.
PORT 192,168,1,55,14,100
200 PORT Command successful.
LIST
150 Opening ASCII mode data connection for /bin/ls.
426 Data connection closed, transfer aborted.
PASV
227 Entering Passive Mode (61,129,34,21,15,103)
错误:[数据]: 连接超时 可能连的人太多了吧 我都无法连接上。。。。。。。。
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